Apr-Sep: 10am-8.30pm; mid Feb-Mar and Oct-early Nov: 10am-5.30pm
This is the unfinished part of a 23-km long defensive maze built in 1745. It connected the various parts of the fortress. During the air raids in the Second World War, its corridors were used as shelters. An archaeological crypt encloses several ruins which, accompanied by an audiovisual display, describe the site's history. Don't miss the views from certain openings onto the ravine and the Rham district.
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